Não informado. (1930). Civil Engineering. American Society of Civil Engineers.
Lua i Stíl Chicago (17ú heag.)Não informado. Civil Engineering. New York: American Society of Civil Engineers, 1930.
Lua MLA (8ú heag.)Não informado. Civil Engineering. American Society of Civil Engineers, 1930.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.